Micro-X-Ray diffraction study of new nickel-titanium rotary endodontic instruments

William A. Brantley, Masahiro Iijima, William A.T. Clark, Scott R. Schricker, John M. Nusstein, Itaru Mizoguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Background: Next-generation rotary endodontic instruments with improved clinical performance are being fabricated from special superelastic NiTi wires. We are reporting the initial metallurgical study of two recently introduced rotary instruments, HyFlex® CM™ (Coltène Whaledent) and Vortex Blue® (Dentsply Tulsa Dental Specialties), using Micro-X-ray diffraction. A wide range of sizes and tapers was examined, and analyses were performed at five sites on each instrument. Results: Similar x-ray diffraction patterns were observed for both instruments, and no dependence on size and taper was found. The lowest-intensity peaks occurred for the tip region. Four austenite peaks and one martensite peak were evident, along with a lower-angle peak that matched anatase titanium oxide. Preferred orientation existed for both austenite and martensite. Conclusions: Instruments were manufactured by similar proprietary processes. Future metallographic, SEM and TEM observations are needed to characterize instrument microstructures fully, since x-ray diffraction peak intensities are considerably diminished for the work-hardened martensite phase.

Original languageEnglish
Title of host publicationBiomaterials Science
Subtitle of host publicationProcessing, Properties and Applications V
EditorsSusmita Bose, Amit Bandyopadhyay, Roger Narayan
PublisherAmerican Ceramic Society
Pages47-54
Number of pages8
ISBN (Electronic)9781119190028
Publication statusPublished - 2015
Externally publishedYes
EventNext Generation Biomaterials and Surface Properties of Biomaterials Symposia - Materials Science and Technology 2014 Conference, MS and T 2014 - Pittsburgh, United States
Duration: 2014 Oct 122014 Oct 16

Publication series

NameCeramic Transactions
Volume254
ISSN (Print)1042-1122

Other

OtherNext Generation Biomaterials and Surface Properties of Biomaterials Symposia - Materials Science and Technology 2014 Conference, MS and T 2014
Country/TerritoryUnited States
CityPittsburgh
Period14/10/1214/10/16

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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